Merge from vscode merge-base (#22780)

* Revert "Revert "Merge from vscode merge-base (#22769)" (#22779)"

This reverts commit 47a1745180.

* Fix notebook download task

* Remove done call from extensions-ci

build/npm/setupBuildYarnrc.js

@@ -0,0 +1,25 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+const path = require('path');
+const fs = require('fs');
+
+// make sure we install the deps of build for the system installed
+// node, since that is the driver of gulp
+function setupBuildYarnrc() {
+	const yarnrcPath = path.join(path.dirname(__dirname), '.yarnrc');
+	const yarnrc = `disturl "https://nodejs.org/download/release"
+target "${process.versions.node}"
+runtime "node"
+arch "${process.arch}"`;
+
+	fs.writeFileSync(yarnrcPath, yarnrc, 'utf8');
+}
+
+exports.setupBuildYarnrc = setupBuildYarnrc;
+
+if (require.main === module) {
+	setupBuildYarnrc();
+}